This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A156757 #5 May 08 2012 13:58:02 %S A156757 1,-1,-99,299,49401,-249001,-60251499,425252099,136795497201, %T A156757 -1241382296401,-498990299504499,5534485665505499,2669489641160743401, %U A156757 -34991633084859742201,-19690651784477632959099,297813229679687736760499,191527704666360326602988001 %N A156757 Numerator of Euler(n, 9/20). %H A156757 Vincenzo Librandi, <a href="/A156757/b156757.txt">Table of n, a(n) for n = 0..200</a> %t A156757 Numerator[EulerE[Range[0,20],9/20]] (* _Vincenzo Librandi_, May 08 2012 *) %Y A156757 For denominators see A009964. %K A156757 sign,frac %O A156757 0,3 %A A156757 _N. J. A. Sloane_, Nov 07 2009